The Experts below are selected from a list of 134580 Experts worldwide ranked by ideXlab platform
Xing Chen - One of the best experts on this subject based on the ideXlab platform.
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study on phosphor sedimentation effect in white light emitting diode packages by modeling multi layer Phosphors with the modified kubelka munk theory
Journal of Applied Physics, 2013Co-Authors: Run Hu, Yiman Wang, Xing ChenAbstract:In this study, we studied the phosphor sedimentation effect in white phosphor-converted light-emitting diode packages by modeling the multi-layer Phosphors with gradient concentrations. The essence of phosphor sedimentation can attribute to the variation of phosphor concentrations. By modifying the Kubelka-Munk theory, we built a multi-layer phosphor model with considering the light scattering, light absorption, and light conversion process simultaneously. With a brief review of Kubelka-Munk theory, multi-layer Phosphors were modeled on the basis of single-layer phosphor model. The phosphor sedimentation effect was characterized by modeling multi-layer Phosphors with gradient concentrations, whereas keeping the total amount of Phosphors at the same level. It is found from the five calculation cases that phosphor sedimentation will cause the drop of light extraction efficiency (LEE) by 13.04%. Furthermore, the phosphor layer with inverse-gradient concentrations will enhance the LEE 16.56%. To figure out th...
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Study on phosphor sedimentation effect in white light-emitting diode packages by modeling multi-layer Phosphors with the modified Kubelka-Munk theory
Journal of Applied Physics, 2013Co-Authors: Yiman Wang, Sheng Liu, Xing Chen, Yong Zou, Xiaobing LuoAbstract:In this study, we studied the phosphor sedimentation effect in white phosphor-converted light-emitting diode packages by modeling the multi-layer Phosphors with gradient concentrations. The essence of phosphor sedimentation can attribute to the variation of phosphor concentrations. By modifying the Kubelka-Munk theory, we built a multi-layer phosphor model with considering the light scattering, light absorption, and light conversion process simultaneously. With a brief review of Kubelka-Munk theory, multi-layer Phosphors were modeled on the basis of single-layer phosphor model. The phosphor sedimentation effect was characterized by modeling multi-layer Phosphors with gradient concentrations, whereas keeping the total amount of Phosphors at the same level. It is found from the five calculation cases that phosphor sedimentation will cause the drop of light extraction efficiency (LEE) by 13.04%. Furthermore, the phosphor layer with inverse-gradient concentrations will enhance the LEE 16.56%. To figure out the reasons, the light losses were calculated, and it is proved that the light loss is enhanced when phosphor sedimentation happens.
Menglian Gong - One of the best experts on this subject based on the ideXlab platform.
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single phased white light emitting nacabo3 ce3 tb3 mn2 Phosphors for led applications
Dalton Transactions, 2014Co-Authors: Xinguo Zhang, Menglian GongAbstract:A series of NaCaBO3:Ce3+,Tb3+,Mn2+ borate Phosphors were prepared via a high-temperature solid-state reaction. The obtained Phosphors exhibit a strong excitation band between 250 and 400 nm, matching well with the dominant emission band of a NUV light-emitting-diode (LED) chip. The Phosphors can generate light from blue to green, and from blue to red by Ce3+→Tb3+ and Ce3+→Mn2+, respectively. Furthermore, a wide-range-tunable white light emission was obtained by precisely controlling the contents of Ce3+, Mn2+, Tb3+. The results show that this phosphor has potential applications as a single-phased phosphor for NUV white LEDs.
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low thermal quenching and high efficiency ce3 tb3 co doped ca3sc2si3o12 green phosphor for white light emitting diodes
Journal of Luminescence, 2011Co-Authors: Yibo Chen, Kok Wai Cheah, Menglian GongAbstract:Abstract Low thermal quenching and high-efficiency Ca3Sc2Si3O12:Ce3+ (CSSO:Ce3+) Phosphors with co-doping Tb3+ ion were prepared by a solid state method and the properties of these Phosphors were investigated. The results showed that co-doping of Tb3+ not only enhances the photoluminescence remarkably and decreases the thermal quenching of the phosphor, but also heightens the performances of the LEDs fabricated with the phosphor. A high-efficiency and low color temperature white LED was fabricated with the prepared CSSO:1%Ce3+, 0.5%Tb3+ and a red phosphor, indicating that CSSO:1%Ce3+,0.5%Tb3+ phosphor is a suitable green phosphor for the fabrication of high-efficiency white LEDs.
Yiman Wang - One of the best experts on this subject based on the ideXlab platform.
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study on phosphor sedimentation effect in white light emitting diode packages by modeling multi layer Phosphors with the modified kubelka munk theory
Journal of Applied Physics, 2013Co-Authors: Run Hu, Yiman Wang, Xing ChenAbstract:In this study, we studied the phosphor sedimentation effect in white phosphor-converted light-emitting diode packages by modeling the multi-layer Phosphors with gradient concentrations. The essence of phosphor sedimentation can attribute to the variation of phosphor concentrations. By modifying the Kubelka-Munk theory, we built a multi-layer phosphor model with considering the light scattering, light absorption, and light conversion process simultaneously. With a brief review of Kubelka-Munk theory, multi-layer Phosphors were modeled on the basis of single-layer phosphor model. The phosphor sedimentation effect was characterized by modeling multi-layer Phosphors with gradient concentrations, whereas keeping the total amount of Phosphors at the same level. It is found from the five calculation cases that phosphor sedimentation will cause the drop of light extraction efficiency (LEE) by 13.04%. Furthermore, the phosphor layer with inverse-gradient concentrations will enhance the LEE 16.56%. To figure out th...
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Study on phosphor sedimentation effect in white light-emitting diode packages by modeling multi-layer Phosphors with the modified Kubelka-Munk theory
Journal of Applied Physics, 2013Co-Authors: Yiman Wang, Sheng Liu, Xing Chen, Yong Zou, Xiaobing LuoAbstract:In this study, we studied the phosphor sedimentation effect in white phosphor-converted light-emitting diode packages by modeling the multi-layer Phosphors with gradient concentrations. The essence of phosphor sedimentation can attribute to the variation of phosphor concentrations. By modifying the Kubelka-Munk theory, we built a multi-layer phosphor model with considering the light scattering, light absorption, and light conversion process simultaneously. With a brief review of Kubelka-Munk theory, multi-layer Phosphors were modeled on the basis of single-layer phosphor model. The phosphor sedimentation effect was characterized by modeling multi-layer Phosphors with gradient concentrations, whereas keeping the total amount of Phosphors at the same level. It is found from the five calculation cases that phosphor sedimentation will cause the drop of light extraction efficiency (LEE) by 13.04%. Furthermore, the phosphor layer with inverse-gradient concentrations will enhance the LEE 16.56%. To figure out the reasons, the light losses were calculated, and it is proved that the light loss is enhanced when phosphor sedimentation happens.
Xiaobing Luo - One of the best experts on this subject based on the ideXlab platform.
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Study on phosphor sedimentation effect in white light-emitting diode packages by modeling multi-layer Phosphors with the modified Kubelka-Munk theory
Journal of Applied Physics, 2013Co-Authors: Yiman Wang, Sheng Liu, Xing Chen, Yong Zou, Xiaobing LuoAbstract:In this study, we studied the phosphor sedimentation effect in white phosphor-converted light-emitting diode packages by modeling the multi-layer Phosphors with gradient concentrations. The essence of phosphor sedimentation can attribute to the variation of phosphor concentrations. By modifying the Kubelka-Munk theory, we built a multi-layer phosphor model with considering the light scattering, light absorption, and light conversion process simultaneously. With a brief review of Kubelka-Munk theory, multi-layer Phosphors were modeled on the basis of single-layer phosphor model. The phosphor sedimentation effect was characterized by modeling multi-layer Phosphors with gradient concentrations, whereas keeping the total amount of Phosphors at the same level. It is found from the five calculation cases that phosphor sedimentation will cause the drop of light extraction efficiency (LEE) by 13.04%. Furthermore, the phosphor layer with inverse-gradient concentrations will enhance the LEE 16.56%. To figure out the reasons, the light losses were calculated, and it is proved that the light loss is enhanced when phosphor sedimentation happens.
Yibo Chen - One of the best experts on this subject based on the ideXlab platform.
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low thermal quenching and high efficiency ce3 tb3 co doped ca3sc2si3o12 green phosphor for white light emitting diodes
Journal of Luminescence, 2011Co-Authors: Yibo Chen, Kok Wai Cheah, Menglian GongAbstract:Abstract Low thermal quenching and high-efficiency Ca3Sc2Si3O12:Ce3+ (CSSO:Ce3+) Phosphors with co-doping Tb3+ ion were prepared by a solid state method and the properties of these Phosphors were investigated. The results showed that co-doping of Tb3+ not only enhances the photoluminescence remarkably and decreases the thermal quenching of the phosphor, but also heightens the performances of the LEDs fabricated with the phosphor. A high-efficiency and low color temperature white LED was fabricated with the prepared CSSO:1%Ce3+, 0.5%Tb3+ and a red phosphor, indicating that CSSO:1%Ce3+,0.5%Tb3+ phosphor is a suitable green phosphor for the fabrication of high-efficiency white LEDs.